Harvest cucumbers every 2 to 3 days and promptly pick the fruits when they reach the desired size. Pickling varieties should be harvested when the fruits are 2 to 4 inches long. Slicing cucumbers should be 6 to 8 inches long and 1.5 to 2 inches in diameter, but still dark green and firm. Over-mature cucumbers left on the vine inhibit additional fruit set.
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